<template>
  <div class="spec-preview">
    <img ref="img1" :src="skuInfo.skuDefaultImg" />
    <div class="event" @mousemove="move"></div>

    <div class="big">
      <img
        ref="img2"
        :src="skuInfo.skuDefaultImg"
        :style="{ left: -2 * left + 'px', top: -2 * top + 'px' }"
      />
    </div>
    <div class="mask" :style="{ left: left + 'px', top: top + 'px' }"></div>
  </div>
</template>

<script>
import { mapGetters } from "vuex";
export default {
  name: "Zoom",
  data() {
    return {
      left: 0,
      top: 0,
    };
  },
  computed: {
    ...mapGetters("detail", ["skuInfo"]),
  },
  methods: {
    move(event) {
      let x = event.offsetX - 100;
      if (x < 0) x = 0;
      if (x > 200) x = 200;
      this.left = x;
      let y = event.offsetY - 100;
      if (y < 0) x = 0;
      if (y > 200) x = 200;
      this.top = y;
    },
  },
  mounted() {
    this.$bus.$on("get-image", (imgUrl) => {
      // console.log("imgUrl", imgUrl);
      this.$nextTick(() => {
        this.$refs.img1.src = imgUrl;
        this.$refs.img2.src = imgUrl;
      });
    });
  },
  beforeDestroy() {
    this.$bus.$off("get-image");
  },
};
</script>

<style lang="less">
.spec-preview {
  position: relative;
  width: 400px;
  height: 400px;
  border: 1px solid #ccc;

  img {
    width: 100%;
    height: 100%;
  }

  .event {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 998;
  }

  .mask {
    width: 50%;
    height: 50%;
    background-color: rgba(0, 255, 0, 0.3);
    position: absolute;
    left: 0;
    top: 0;
    display: none;
  }

  .big {
    width: 100%;
    height: 100%;
    position: absolute;
    top: -1px;
    left: 100%;
    border: 1px solid #aaa;
    overflow: hidden;
    z-index: 998;
    display: none;
    background: white;

    img {
      width: 200%;
      max-width: 200%;
      height: 200%;
      position: absolute;
      left: 0;
      top: 0;
    }
  }

  .event:hover ~ .mask,
  .event:hover ~ .big {
    display: block;
  }
}
</style>